Disadvantages: Sea - during a volcanic eruption earthquakes happen‚ and tsunamis may be created. Also‚ if it is a volcanic island‚ the island may be destroyed‚ and there is no escape. Lava flow - these are very slow moving‚ but destructive as they cannot be stopped and they set fire to everything in their path. Pyroclastic flow - these are impossible to outrun‚ travelling at about 300 km/h‚ and are extremely destructive Mudflow/lahar - these are mud rivers that have the consistency of cement
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on where and when they occur’. Discuss this statement A hazard can be defined as a situation that poses a threat to life‚ health‚ property or the environment. The severity and type of volcanic hazards that occur are mainly dependent on the type of magma. Volcanic processes can be split into two categories – primary hazards and secondary hazards. The primary hazards that can occur are pyroclastic flows‚ lava flows‚ tephra and poisonous gases. The secondary hazards include Lahars‚ volcanic landslides
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different stages that produce three different types of rock. Igneous rock makes up the foundation on which the Earth’s continents sit. This type of rock is made as magma cools over time‚ crystalline structures begin to form. Volcanic eruptions send magma across the Earth’s surface as well as into underground layers. The magma that settles underground cools slower than what makes its way to the Earth’s surface. In effect‚ igneous rock can form on the surface or within the underground layers. Volcanic
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“The extent to which tectonic processes represent hazards depends on when and where they are experienced. Discuss” Throughout this essay I will be discussing my view on the extent to which I think tectonic processes represent hazards depending on when and where they are experienced. My view is that the hazards caused by tectonic processes such as volcanoes and earthquakes are very much likely to have a bigger impact socially‚ environmentally and economically depending on where they had occurred
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Continental Drift and Plate Tectonics Theory (Part 1a) Introduction: The Beginning of the “Continental Drift Theory” In the middle of the eighteenth century‚ James Hutton proposed a theory‚ uniformitarianism; “the present is the key to the past”. It held that processes such as geologic forces- gradual and catastrophic-occurring in the present were the same that operated in the past. (Matt Rosenberg‚ 2004) This theory coincides with the theory of Continental Drift that was first proposed by Abraham
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Landforms are the physical features of the earth. They are described with particular attention to the contours of the land slope‚ elevation and morphology as well as the context in which the landform resides. For instance‚ landforms may be categorized based on how they are formed (such as by erosion) or what surrounds them (such as surrounded by water or mountains). Landforms are distinct from the biota (plant and animal life) that inhabit the ecosystems contained within the landform. Scale -
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GENERAL GEOLOGY - GEOL 1113 EXAM I WITH ANSWERS - Spring 2002 Below you will find the questions and answers for Exam I in my General Geology class. The correct answer for each question is highlighted in bold face green type. While you are reviewing the exam‚ pause at the questions you find you missed and try to understand why you missed them. Really understanding this will require not only that you understand why your answer is incorrect‚ but also why you chose it in the first place. Were you confused
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earthquakes occur (like Pinatubo in 1991). The most severe volcanic eruptions occur on destructive plate boundaries. As the subducted Eurasian plate metls underneath the mantle‚ the molten rock forms a magma chamber; with some of this magma becoming explosive when combines with gases inside the chamber. This magma then solidifies just below the earth’s surface‚ forming a solid cap over the volcano’s vent. Pressure then builds up underneath‚
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Beautiful and powerful‚awe-insipiring and deadly‚they are spectacular reminders of the dynamic forces that shape our planet. Volcano - a fissure or vent through which molten rock material‚ or magma‚ and gases from the interior of the Earth erupt on to its surface‚ and the landform which is produced as a result of this eruption. The word "volcano" comes from Vulcano‚ one of the volcanic Lipari Islands in the Mediterranean Sea‚ and the place where
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EXPLORING LOIHI: THE NEXT HAWAIIAN ISLAND Twenty-one miles off the Big Island‚ nearly 3‚000 feet beneath the waves‚ an island is struggling to be born. Researchers are taking submersibles to the very bottom of the sea to watch the process unfold. Quiet as a falling pebble‚ the Pisces V submersible begins its descent to the ocean floor. Soon the downwelling light wanes and the pilot and a pair of scientists inside are swallowed up in inky blackness - a darkness as absolute as interstellar space
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